Haas won his first Masters 1000 match since 2014 and won at Monte-Carlo for the first time since 2004. Haas, 39 and a former quarterfinalist at Monte-Carlo, had not played in the Principality since 2008.

He saved three of four break points to avenge a loss to Paire at the Australian Open this year. That loss was mentioned in a feisty tweet by Haas’ wife, Sara Foster, who attacked Paire and called him a “tool” after she got wind of Paire’s post-match comments about Haas (click the link in her tweet to read what Paire said).

Foster’s comments bring to light a subject we have wanted to talk about for some time. Why to players always have to say they played bad after losses? We hear it time and time again from ATP and WTA pros. Is it because they want their opponent to second-guess the victory? Do they just have trouble admitting they’ve been beaten? Is it a pride thing? It’s something we’ve always considered bad form, but it happens so often that we have always figured there must be some psychological edge to gain from it.

It’s not the first time that Foster has taken to Twitter to defend her husband. So beware of what you say on Twitter about the 39-year-old.